Arrange the children for Grid

   
        

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  Title="About WPF" 
  Background="OrangeRed">
    <Grid Background="LightBlue">
      <!-- Define four rows: -->
      <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition/>
        <RowDefinition/>
        <RowDefinition/>
      </Grid.RowDefinitions>
    
      <!-- Define two columns: -->
      <Grid.ColumnDefinitions>
        <ColumnDefinition Width="Auto"/>
        <ColumnDefinition/>
      </Grid.ColumnDefinitions>
    
      <Label    Grid.Row="0" Grid.Column="0" Background="Blue" Foreground="White" HorizontalContentAlignment="Center"
                Grid.ColumnSpan="2">Start Page</Label>
      <GroupBox Grid.Row="1" Grid.Column="0" Background="White" Header="Recent Projects">...</GroupBox>
      <GroupBox Grid.Row="2" Grid.Column="0" Background="White" Header="Getting Started">...</GroupBox>
      <GroupBox Grid.Row="3" Grid.Column="0" Background="White" Header="Headlines">...</GroupBox>
      <GroupBox Grid.Row="1" Grid.Column="1" Background="White" Header="Online Articles" Grid.RowSpan="3">
        <ListBox>
          <ListBoxItem>Article #1</ListBoxItem>
          <ListBoxItem>Article #2</ListBoxItem>
          <ListBoxItem>Article #3</ListBoxItem>
          <ListBoxItem>Article #4</ListBoxItem>
        </ListBox>
      </GroupBox>
    </Grid>


</Window>